Compact Cage Antenna : by: Vladislav Shcherbakov, RU3ARJ

Everyone knows "classical" quad antenna. Its perimeter is equal to wavelength. Each side of the quad is 1/4 wavelength. Amplification of the "classical" quad antenna is 3-dBi, input impedance (in a free space) is close to 120-Ohm. Good antenna but the size!

It is possible to reduce its size by folding it in a "cage" shape. The simplest cage in which the antenna may be transformed is a cage of 10 sections 0.11 wavelength each. The Compact Cage Antenna (CCA) gain is 1.5-dBi and input impedance is close to 50-Ohm.

PDF file, 170 KB (ANTENTOP-01-2009, pp: 32- 35)

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Files MMANA:

Trihat- quad

Trihat- quad-1

cca_open_corner

cca_bended

Vladislav Shcherbakov, RU3ARJ

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